• Kovar Expansion Precision Alloy Ni29co18 Uns K94610 (4J29) Bar/Rod
  • Kovar Expansion Precision Alloy Ni29co18 Uns K94610 (4J29) Bar/Rod
  • Kovar Expansion Precision Alloy Ni29co18 Uns K94610 (4J29) Bar/Rod
  • Kovar Expansion Precision Alloy Ni29co18 Uns K94610 (4J29) Bar/Rod

Kovar Expansion Precision Alloy Ni29co18 Uns K94610 (4J29) Bar/Rod

Classification: Rare Metal
Status: Bright
Transport Package: Cartons (40cm*40cm*50cm); Braided Bags, Spools
Specification: SGS
Trademark: Ualloy
Origin: Zhejiang, China
Samples:
US$ 0/Piece 1 Piece(Min.Order)
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Customization:
Diamond Member Since 2012

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Basic Info.

Model NO.
Ni29Co18 UNS K94610 (4J29)
HS Code
75052200
Production Capacity
500tons/Year

Product Description



1.Description:  

4J29(China); 29H, 29H-B, Techallony(Russia); Kovar, Rodar, Glasseal 29-17(United States); Nilo K, Telcaseal(Great Britain); KV-1, KV-2, KV-3(Japan); Dilver P0, Dilver P1(France); Vacon 12, Silvar 48(Germany).

4J29 expansion alloy, also known as Kovar alloy, is a Nickel Iron alloy with 29% Nickel, 17% Cobalt and the remaining balance is Iron. The expansion characteristics of Kovar match both borosilicate (or Pyrex) glasses and alumina ceramics, making it one of the most popular controlled expansion alloys for hermetic sealing applications. Kovar is produced to ensure good properties for machining and deep drawing, and is a porosity free product. You'll find Kovar in applications such as power tubes, microwave tubes, transistors, diodes, hybrid packages, and other kinds of scientific instruments.
 
 
 
2. Chemical composition(%)
 
 
 

Grade

C

Si

Mn

P

S

Ni

Co

Fe

4J29

0.015

0.12

0.25

0.006

0.005

29.10

17.3

Bal

 
 
 
 
3. Physical properties
 
 
 

 
 
Grade

 
 
Density(g/cm3)

Thermal expansion coefficient (10-6/°C)

 
Curie point(°C)

 
Volume resistivity(μΩ.cm)

 
Thermal conductivity(W/m. °C)

4J29

8.17

5.0(20~300°C)
5.2(20~450°C

430

46(20°C)

20.3

 
 
 
 
4. Mechnical properties
 
 
 

 
 
Grade

 
Yield Strength(Mpa)

 
 
Tensile Strength

 
 
Elongation(%)

 
 
Hardness(HV)

 
4J29

Temper rolled

695

780

5

230

As annealed

315

520

24

148

 
 
 
 
 
5.Application
The alloy is widely used as glass sealing for electronic vacuum devices, such as launching tube, oscillating tube, ignitron, magnetron, transistor, sealing plug, relay, leading wire of integrated circuit, chassis, shell, scaffold and so on.
 
 
6.size
Rods: hot rolling rods    Φ8~38mm
Cold-drawn rods ≤50mm
Forged rods  Φ38~350mm


 
7.Advantages
1.Pass: ISO9001 certification 
2.fine after-sale services 
3.small order accepted 
4.samples available 
5.short delivery time 

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